Статья

XPS study of ion irradiated and unirradiated CeO2 bulk and thin film samples

К. И. МаслаковChemistry Department, Lomonosov Moscow State University, Moscow 119991, RussiaYury A. TeterinChemistry Department, Lomonosov Moscow State University, Moscow 119991, RussiaAleksej J. PopelDepartment of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, United KingdomA. Yu. TeterinNRC “Kurchatov Institute”, Moscow 123182, RussiaK. E. IvanovNRC “Kurchatov Institute”, Moscow 123182, RussiaStepan N. KalmykovChemistry Department, Lomonosov Moscow State University, Moscow 119991, RussiaVladimir G. PetrovChemistry Department, Lomonosov Moscow State University, Moscow 119991, RussiaPeter K. PetrovDepartment of Materials and London Centre for Nanotechnology, Imperial College London, London SW7 2AZ, United KingdomIan FarnanDepartment of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, United Kingdom

2018en

ABI

Аннотация

This work considers the effect of fission-energy ion irradiation on the electronic structure at the surface of bulk and thin film samples of CeO2 as a simulant for UO2 nuclear fuel. For this purpose, thin films of CeO2 grown on Si substrates and bulk CeO2 samples were irradiated by Xe ions (92 MeV, 4.8 × 1015 ions/cm2) to simulate the fission damage that occurs within nuclear fuels. The irradiated and unirradiated samples were characterized by X-ray photoelectron spectroscopy. A technique of the quantitative evaluation of cerium ionic composition on the surface of the samples has been successfully applied to the obtained XPS spectra. This technique is based on the intensity of only one of the reliably identifiable high-energy peak at 916.6 eV in the Ce 3d XPS spectra. The as-produced samples were found to contain mostly the Ce4+ ions with a small fraction of Ce3+ ions formed on the surface in the air or under X-rays. The core-electron XPS structure of CeO2 was associated with the complex final state with vacancies (holes) resulting from the photoemission of an inner electron. The Xe ion irradiation was found to increase the Ce3+ content in the samples of CeO2, with the thin films being more sensitive than the bulks samples.

Перевод пока недоступен

Идентификаторы

DOI: 10.1016/j.apsusc.2018.04.077

Цитирования и источники

Цитирований: 2Использованных источников: 0

Показатели — AkademScholar